The `/sessions` picker's selection background was subtle enough
to disappear in low-contrast dark themes — keyboard navigation
moved the focus indicator but the visual change between focused
and unfocused rows was hard to notice, especially when running
the TUI in a terminal with a near-black background.
The selected row now renders with a bolded label on a stronger
background so the focused row reads cleanly across the dark
palettes the TUI ships with. The non-selected rows are unchanged
so the change doesn't add visual noise on light terminals.
Test pin: `build_list_lines_selected_row_uses_strong_highlight`
ensures the rendered row at the selected index applies the
expected modifier and background combination.
Harvested from PR #1493 by @reidliu41
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Hunter Bown
e1b959a36f